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H. W. BUSSB. COMBINED KNOB LATCH AND DOOR'LOGK.

No. 75,360. Patented Mar. 10, 1868.

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rm- Ncams PETERS cov Pnoamnc. wAswNmcN u c describe the samewi'thparticularity, making reference in so d Laim Param No. tatoo, daadMarch 1o, 186s.

IMPROVEMENT IN COMBINED KNB-LATGH AND DOOR-LOOK.

titte ,Srtetule rzfemh tu in this: etters tant mit mating part tf ttesame.

TO ALL WHOM IT MAY CONGERN:

Be it known that I, HENRY W. BUSSE, oi' Chicago, in the county of Cook,and State of Illinois, have invented a new and useful Improvement inDoor-Locks; and I do hereby declare and make known that the following isa full, clear', and exact description of the same, reference being hadto the accompanying draw-l ings, and the letters and figures markedthereon, which form part of this specification.

To enable those skilied in the art to understand how toconstruct and usemy invention, I will proceed to oing to the aforesaid drawings= inwhich- Figure 1 represents an interior view of the lock..

Figure 2 is a similar View, the .platoG being removed.

vFigure 3 is a transverse section, taken through the key-hole; and

Figure 4 is a detached View oiu the key of the lock.

Similar letters of reference in the several figures indicate the sameparts of my invention.

A represents the case of the lock, B the ordinary latch, operated by theknobs, whose spindle passes through the socket b in the usual manner. Cis tho'bolt, operated by thekey, as hereinafter specified, beingprovided with a knob, g, passing through a slot inthe in'ner face of theloek-ease, so that. the-bolt may be operated. from the inside by movingsaid. knob. i

D represents la bent arm or lever pivoted at D', one end of thesame'operating in the notch in the under side of the latch'B, and theother ond being provided with a pin, d, projecting through the slot c,in the bolt C, as shown'.

F represents a bar attached to a block, F, Asaid bar F projecting up outoi` the caso A., asshown, so as to beoperatefl by the hand on the insideif desired. At the point where said bar F is attached to the block F,said bar and block really forming one and the same piece, is a tongue,t, which is held down in one of the notches efon the bolt C, by theaction o`f a. spring, a', a spring, a, resting against a shoulder on thelatch B, to keep it out in the positiondesired, in the usual manner.Said bar F F nieves up and down in suitable guides, ZZ, as shown in fg.2.

G represents afplate arranged'ono r over the slide or bai F, being heldrmly in position by lugs la h) as shown, being provided with a key-hole,as shown, through which on'e of the wards of the key passes, ashereinat'ter specified. Said key K is provided with a rod, 7c, whichpasses through the hollow key K, and is provided with a suitable'knob,4L, whereby it may be turned independently of the outer key, K,said rod )t having a bit.' 'mand said key K having a bit, m, eachsusceptible of a separate movement as aforesaid, the bit n being fittedso as to enter the key-ho1ein the plate G, while the bit m cannot'. Whendesired, the bolt C is thrown out it may beiocked so as tb renderitjuipossiblo to open it from without by means of the dog E, as shown.

Having described the construction of my invention, I wi'llproceed todescribe, its operation.

As the bits m n do not project from their posts in tie same linewhen theheads of the keys are-parallel, te insert-the key in the lock it isnecessary to enter the key and turnthe bit 1t until it enters thekey-hole in the plate G, and `passes beneath it, which will then permitthe bit m to enter the key-hole in tho case A. Iii iig. 1

the parts are represented as being locked, and in unlocking, tho dog Emust be turned down away from the bolt C.

It will be observed that the bolt B is locked also, and kept from movingback by the-arm D, and thisarm cannot he moved away until the bolt C iswithdrawn, to accomplish which the tongiie t must be raised up from thenotch f in the said-bolt, which is the {irst thing to be'done. The rod cis, therefore, first turned vun'til the bit n comes against the shoulderr on thebar F F', when it is moved up far enough to withdraw the tonguet' from the said notchf. l.The key K is then turned so as to bringthehit m against the shoulder s on the bolt C, when itis readily thrownback, thus also throwing the arm D outlfroni the bolt B, when it may bethro'wn back by the knobs in the ordinary wey, and the door may beopened, the spring a in tho mean time throwing the tongue l down intothenoteh e, and securing the bolt in place. l I

To lock the door-'the bit it is turned as before, until the tongugi isthrown out from the notch e, when the I bit m i's turned against theheel of the bolt C, and throws it out as desired, said movementofthebolt C'moving the arm`D so as to lock the bolt B, while the spring athrows the tonguet into the notchand lecksthe entire works as before.

Having described the construction and operation of my invention, I willnow specify what claim and desire to secure by Letters Patent.

.I clnimthe combination, in a door-lock, of the latch B, provided with ahotch, b, the bolt C, provided with tn. slot, c, and notches ef, thebent arm D, the bar F F', provided with a. tongue, t, the spring a a',and tho'platc G, all arranged and operating substantially as :md for thopurposes specified.

f HENRY W. IBUSSE(` Witnesses AGUST TANCK, JULIUS PAESKE.

